Help! Spotting while on Letrozole?

Estefani
So this i have PCOS and I start taking Letrozole last month from cd4-8 at 2.5mg but the doctor did an ultrasound and said it did not work (no follicles) so she started me that same day on  Letrozole at 5mg now to day is "cd 8" and I am bleeding (bright red) is this normal?
Is it working? Has one of you ladies experience this, I am freaking out?